Labyrinth Piston is an assemblage type piston on which periphery many Labyrinths are treated, and keeps airtight condition by Labyrinth Effect. The piston is designed in the most suited Labyrinth shape and reciprocates keeping the minimum gas between cylinder and piston. Labyrinth Piston Type Compressor is designed to be airtight construction with Labyrinth effect and the gas with normal specifications can be procured at completely dried condition. Therefore, this type compressor is most suited for handling such gases as complete dried gases (N2 etc.), combustible gases liable to be ignited by heat created by friction (O2 etc.) and other gases (recycled gases at the poly-olefin plant) liable to be mixed with mist, dust and etc.